EFFECTS OF TIRE PROFILE WITH LEAN ANGLE
MotoSPEC v5.5 introduced analysis of lean angle and tire profiles in the PRO version of MotoSPEC.
Please see the post 'SPECIFYING TIRE PROFILES' for an explanation of tire profiles.
The image below shows the location of the two contact points in front views of the motorcycle, in the vertical condition and also as the motorcycle leans. In the vertical position, the points of the tire profiles on the center line of the bike are in contact with the ground.
With lean, the chassis pitches forward due to the difference in tire profiles, because the front profile is less wide than the rear profile. The profile points on the center line of the bike are no longer aligned.
The Contact Points are the points on the profiles that are tangent to the ground.
Deformation of the tires is not considered - the contact is simplified to a point.
The front braking force acts perpendicular to this view thru the Front Contact Point.
The drive force applied at the rear tire also acts perpendicular to this view thru the Rear Contact Point.